So I had this BD/DVD-burner for about a year and once burned a 25GB BD-RE with it. But now having reflashed to v 1.35, the drive neither burns nor reads BD disks. It reads/writes CDs/DVDs alright.

Before you arrive at this conclusion, be sure to obtain a range of known good BDs, both pressed and recordable and see. If you just tested it with that BD-RE that you burned "once", and the disc wasn't closed, then it won't be recognized because updating the f/w makes the burner practically a different one post- f/w update.

For the nth time, with the possible exception of certain Intel processors, I don't have/ever owned anything whose name starts with "i".

When I looked up the current version flash, it stated that 1.21 is the most current version. Anything else above that is not recommended and there is none out yet. You may have to wait for company to come out with a flash that is made for it.

You are right. But I did find 1.30 works... 1.35 had problems.... from other posts.

In that case the OP will have to wait for 1.36 to be released.

I really do not understand why some people insist on regularly updating their firmware and risking problems. I've got a Pioneer BD burner that's about 3 years old and I've never updated the firmware after installing it. I've also never had a problem with it. Usually the new firmware contains fixes for problems most users will never see and write strategies for new manufacture runs of discs, but if you use ImgBurn and high quality discs you don't need to update firmware to write to discs.

If the OP is using BD-R LTH discs, it is possible that a new firmware update broke compatibility with those. BD-R LTH discs are tricky. My Pioneer will burn them and read previous burns but my other BD burner, an LG model, can neither burn nor read LTH burns.